Added mounts module #17

gtmoth · 2023-11-06T04:52:25Z

Added a module called mounts to corelens to display mountinfo from a given vmcore.

doc/api.rst

drgn_tools/corelens.py

tests/test_mounts.py

drgn_tools/mounts.py

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brenns10 · 2023-11-17T22:34:46Z

It looks like clicking "accept suggestion" in the Pull Request review will create a commit that credits me using my non-oracle email in a "Co-developed-by' tag. Then the OCA bot will check that email and fail the contributor agreement tag.

Feel free to just squash everything into a single commit and remove the Co-developed-by tags :)

drgn_tools/mounts.py

This module lists all the mount points from a given vmcore Signed-off-by: Gautham Ananthakrishna <[email protected]>

…lock. We have ran into situtaions where optimistic spin on sleeping lock by multiple CPUs causes high sys load, which further leads to other issues. This helper allows to check for such spinners. Some examples from a vmcore where system ran into fork-bomb: >>> scan_osq_node(prog) There are spinners on one or more osq_lock CPU(s): [21, 17, 59, 67, 6, 0, 28, 53, 4, 41, 55, 38, 63, 23, 27, 19, 36] are spinning on same osq_lock CPU(s): [42, 56, 35, 18, 22, 3, 1] are spinning on same osq_lock CPU(s): [70, 44, 9] are spinning on same osq_lock CPU(s): [16, 26] are spinning on same osq_lock >>> scan_osq_node(prog,1) There are spinners on one or more osq_lock CPU(s): [21, 17, 59, 67, 6, 0, 28, 53, 4, 41, 55, 38, 63, 23, 27, 19, 36] are spinning on same osq_lock CPU: 21 has been spinning for 1.2 seconds. CPU: 17 has been spinning for 1.3 seconds. CPU: 59 has been spinning for 1.3 seconds. CPU: 67 has been spinning for 1.5 seconds. ....................................... ....................................... CPU: 19 has been spinning for 3.004 seconds. CPU: 36 has been spinning for 3.1 seconds. ...................................... >>> scan_osq_node(prog,2) There are spinners on one or more osq_lock CPU(s): [21, 17, 59, 67, 6, 0, 28, 53, 4, 41, 55, 38, 63, 23, 27, 19, 36] are spinning on same osq_lock CPU: 21 has been spinning for 0.0 seconds. Call stack at cpu: 21 PID: 64691 TASK: ffff8fac01282f80 [R] CPU: 21! COMMAND: "bash" !# 0 [ffffa447d645fb58] node_cpu at 0xffffffff960f3748 kernel/locking/osq_lock.c:27:0 !# 1 [ffffa447d645fb58] osq_lock at 0xffffffff960f3748 kernel/locking/osq_lock.c:143:0 # 2 [ffffa447d645fb68] rwsem_optimistic_spin at 0xffffffff96899cc0 kernel/locking/rwsem-xadd.c:451:0 # 3 [ffffa447d645fb68] __rwsem_down_write_failed_common at 0xffffffff96899cc0 kernel/locking/rwsem-xadd.c:529:0 # 4 [ffffa447d645fb68] rwsem_down_write_failed at 0xffffffff96899cc0 kernel/locking/rwsem-xadd.c:617:0 # 5 [ffffa447d645fbf8] call_rwsem_down_write_failed at 0xffffffff96889537 arch/x86/lib/rwsem.S:117:0 # 6 [ffffa447d645fc40] __down_write at 0xffffffff96898bcd arch/x86/include/asm/rwsem.h:142:0 # 7 [ffffa447d645fc40] down_write at 0xffffffff96898bcd kernel/locking/rwsem.c:72:0 # 8 [ffffa447d645fc58] lock_anon_vma_root at 0xffffffff9623ae3c mm/rmap.c:239:0 # 9 [ffffa447d645fc58] unlink_anon_vmas at 0xffffffff9623ae3c mm/rmap.c:390:0 #10 [ffffa447d645fca8] free_pgtables at 0xffffffff96225231 mm/memory.c:406:0 #11 [ffffa447d645fce8] exit_mmap at 0xffffffff96230f48 mm/mmap.c:3212:0 #12 [ffffa447d645fd98] __mmput at 0xffffffff96097ab2 kernel/fork.c:969:0 #13 [ffffa447d645fd98] mmput at 0xffffffff96097ab2 kernel/fork.c:990:0 #14 [ffffa447d645fdb8] copy_process at 0xffffffff96098801 kernel/fork.c:2058:0 #15 [ffffa447d645fea0] copy_process at 0xffffffff96099db9 kernel/fork.c:1653:0 #16 [ffffa447d645fea0] _do_fork at 0xffffffff96099db9 kernel/fork.c:2153:0 #17 [ffffa447d645ff20] SYSC_clone at 0xffffffff9609a149 kernel/fork.c:2265:0 #18 [ffffa447d645ff20] SyS_clone at 0xffffffff9609a149 kernel/fork.c:2259:0 #19 [ffffa447d645ff30] do_syscall_64 at 0xffffffff96003ca9 arch/x86/entry/common.c:298:0 #20 [ffffa447d645ff58] entry_SYSCALL_64 at 0xffffffff96a001b1 arch/x86/entry/entry_64.S:238:0 ....................................... ....................................... CPU: 36 has been spinning for 3.1 seconds. Call stack at cpu: 36 PID: 16329 TASK: ffff8f85db930000 [R] CPU: 36! COMMAND: bash 0 [ffffa4481243fb68] rwsem_try_write_lock_unqueued at 0xffffffff96899d00 kernel/locking/rwsem-xadd.c:364:0 1 [ffffa4481243fb68] rwsem_optimistic_spin at 0xffffffff96899d00 kernel/locking/rwsem-xadd.c:465:0 2 [ffffa4481243fb68] __rwsem_down_write_failed_common at 0xffffffff96899d00 kernel/locking/rwsem-xadd.c:529:0 3 [ffffa4481243fb68] rwsem_down_write_failed at 0xffffffff96899d00 kernel/locking/rwsem-xadd.c:617:0 # 4 [ffffa4481243fbf8] call_rwsem_down_write_failed at 0xffffffff96889537 arch/x86/lib/rwsem.S:117:0 # 5 [ffffa4481243fc40] __down_write at 0xffffffff96898bcd arch/x86/include/asm/rwsem.h:142:0 # 6 [ffffa4481243fc40] down_write at 0xffffffff96898bcd kernel/locking/rwsem.c:72:0 # 7 [ffffa4481243fc58] lock_anon_vma_root at 0xffffffff9623ae3c mm/rmap.c:239:0 # 8 [ffffa4481243fc58] unlink_anon_vmas at 0xffffffff9623ae3c mm/rmap.c:390:0 # 9 [ffffa4481243fca8] free_pgtables at 0xffffffff96225231 mm/memory.c:406:0 #10 [ffffa4481243fce8] exit_mmap at 0xffffffff96230f48 mm/mmap.c:3212:0 #11 [ffffa4481243fd98] __mmput at 0xffffffff96097ab2 kernel/fork.c:969:0 #12 [ffffa4481243fd98] mmput at 0xffffffff96097ab2 kernel/fork.c:990:0 #13 [ffffa4481243fdb8] copy_process at 0xffffffff96098801 kernel/fork.c:2058:0 #14 [ffffa4481243fea0] copy_process at 0xffffffff96099db9 kernel/fork.c:1653:0 #15 [ffffa4481243fea0] _do_fork at 0xffffffff96099db9 kernel/fork.c:2153:0 #16 [ffffa4481243ff20] SYSC_clone at 0xffffffff9609a149 kernel/fork.c:2265:0 #17 [ffffa4481243ff20] SyS_clone at 0xffffffff9609a149 kernel/fork.c:2259:0 #18 [ffffa4481243ff30] do_syscall_64 at 0xffffffff96003ca9 arch/x86/entry/common.c:298:0 #19 [ffffa4481243ff58] entry_SYSCALL_64 at 0xffffffff96a001b1 arch/x86/entry/entry_64.S:238:0 Signed-off-by: Imran Khan <[email protected]>

…lock(s). We have ran into situtaions where optimistic spin on sleeping lock by multiple CPUs causes high sys load, which further leads to other issues. This helper allows to check for such spinners. Some examples from a vmcore where system ran into fork-bomb: >>> scan_osq_node(prog) There are spinners on one or more osq_lock CPU(s): [21, 17, 59, 67, 6, 0, 28, 53, 4, 41, 55, 38, 63, 23, 27, 19, 36] are spinning on same osq_lock CPU(s): [42, 56, 35, 18, 22, 3, 1] are spinning on same osq_lock CPU(s): [70, 44, 9] are spinning on same osq_lock CPU(s): [16, 26] are spinning on same osq_lock >>> scan_osq_node(prog,1) There are spinners on one or more osq_lock CPU(s): [21, 17, 59, 67, 6, 0, 28, 53, 4, 41, 55, 38, 63, 23, 27, 19, 36] are spinning on same osq_lock CPU: 21 has been spinning for 1.2 seconds. CPU: 17 has been spinning for 1.3 seconds. CPU: 59 has been spinning for 1.3 seconds. CPU: 67 has been spinning for 1.5 seconds. ....................................... ....................................... CPU: 19 has been spinning for 3.004 seconds. CPU: 36 has been spinning for 3.1 seconds. ...................................... >>> scan_osq_node(prog,2) There are spinners on one or more osq_lock CPU(s): [21, 17, 59, 67, 6, 0, 28, 53, 4, 41, 55, 38, 63, 23, 27, 19, 36] are spinning on same osq_lock CPU: 21 has been spinning for 0.0 seconds. Call stack at cpu: 21 PID: 64691 TASK: ffff8fac01282f80 [R] CPU: 21! COMMAND: "bash" !# 0 [ffffa447d645fb58] node_cpu at 0xffffffff960f3748 kernel/locking/osq_lock.c:27:0 !# 1 [ffffa447d645fb58] osq_lock at 0xffffffff960f3748 kernel/locking/osq_lock.c:143:0 # 2 [ffffa447d645fb68] rwsem_optimistic_spin at 0xffffffff96899cc0 kernel/locking/rwsem-xadd.c:451:0 # 3 [ffffa447d645fb68] __rwsem_down_write_failed_common at 0xffffffff96899cc0 kernel/locking/rwsem-xadd.c:529:0 # 4 [ffffa447d645fb68] rwsem_down_write_failed at 0xffffffff96899cc0 kernel/locking/rwsem-xadd.c:617:0 # 5 [ffffa447d645fbf8] call_rwsem_down_write_failed at 0xffffffff96889537 arch/x86/lib/rwsem.S:117:0 # 6 [ffffa447d645fc40] __down_write at 0xffffffff96898bcd arch/x86/include/asm/rwsem.h:142:0 # 7 [ffffa447d645fc40] down_write at 0xffffffff96898bcd kernel/locking/rwsem.c:72:0 # 8 [ffffa447d645fc58] lock_anon_vma_root at 0xffffffff9623ae3c mm/rmap.c:239:0 # 9 [ffffa447d645fc58] unlink_anon_vmas at 0xffffffff9623ae3c mm/rmap.c:390:0 #10 [ffffa447d645fca8] free_pgtables at 0xffffffff96225231 mm/memory.c:406:0 #11 [ffffa447d645fce8] exit_mmap at 0xffffffff96230f48 mm/mmap.c:3212:0 #12 [ffffa447d645fd98] __mmput at 0xffffffff96097ab2 kernel/fork.c:969:0 #13 [ffffa447d645fd98] mmput at 0xffffffff96097ab2 kernel/fork.c:990:0 #14 [ffffa447d645fdb8] copy_process at 0xffffffff96098801 kernel/fork.c:2058:0 #15 [ffffa447d645fea0] copy_process at 0xffffffff96099db9 kernel/fork.c:1653:0 #16 [ffffa447d645fea0] _do_fork at 0xffffffff96099db9 kernel/fork.c:2153:0 #17 [ffffa447d645ff20] SYSC_clone at 0xffffffff9609a149 kernel/fork.c:2265:0 #18 [ffffa447d645ff20] SyS_clone at 0xffffffff9609a149 kernel/fork.c:2259:0 #19 [ffffa447d645ff30] do_syscall_64 at 0xffffffff96003ca9 arch/x86/entry/common.c:298:0 #20 [ffffa447d645ff58] entry_SYSCALL_64 at 0xffffffff96a001b1 arch/x86/entry/entry_64.S:238:0 ....................................... ....................................... CPU: 36 has been spinning for 3.1 seconds. Call stack at cpu: 36 PID: 16329 TASK: ffff8f85db930000 [R] CPU: 36! COMMAND: bash 0 [ffffa4481243fb68] rwsem_try_write_lock_unqueued at 0xffffffff96899d00 kernel/locking/rwsem-xadd.c:364:0 1 [ffffa4481243fb68] rwsem_optimistic_spin at 0xffffffff96899d00 kernel/locking/rwsem-xadd.c:465:0 2 [ffffa4481243fb68] __rwsem_down_write_failed_common at 0xffffffff96899d00 kernel/locking/rwsem-xadd.c:529:0 3 [ffffa4481243fb68] rwsem_down_write_failed at 0xffffffff96899d00 kernel/locking/rwsem-xadd.c:617:0 # 4 [ffffa4481243fbf8] call_rwsem_down_write_failed at 0xffffffff96889537 arch/x86/lib/rwsem.S:117:0 # 5 [ffffa4481243fc40] __down_write at 0xffffffff96898bcd arch/x86/include/asm/rwsem.h:142:0 # 6 [ffffa4481243fc40] down_write at 0xffffffff96898bcd kernel/locking/rwsem.c:72:0 # 7 [ffffa4481243fc58] lock_anon_vma_root at 0xffffffff9623ae3c mm/rmap.c:239:0 # 8 [ffffa4481243fc58] unlink_anon_vmas at 0xffffffff9623ae3c mm/rmap.c:390:0 # 9 [ffffa4481243fca8] free_pgtables at 0xffffffff96225231 mm/memory.c:406:0 #10 [ffffa4481243fce8] exit_mmap at 0xffffffff96230f48 mm/mmap.c:3212:0 #11 [ffffa4481243fd98] __mmput at 0xffffffff96097ab2 kernel/fork.c:969:0 #12 [ffffa4481243fd98] mmput at 0xffffffff96097ab2 kernel/fork.c:990:0 #13 [ffffa4481243fdb8] copy_process at 0xffffffff96098801 kernel/fork.c:2058:0 #14 [ffffa4481243fea0] copy_process at 0xffffffff96099db9 kernel/fork.c:1653:0 #15 [ffffa4481243fea0] _do_fork at 0xffffffff96099db9 kernel/fork.c:2153:0 #16 [ffffa4481243ff20] SYSC_clone at 0xffffffff9609a149 kernel/fork.c:2265:0 #17 [ffffa4481243ff20] SyS_clone at 0xffffffff9609a149 kernel/fork.c:2259:0 #18 [ffffa4481243ff30] do_syscall_64 at 0xffffffff96003ca9 arch/x86/entry/common.c:298:0 #19 [ffffa4481243ff58] entry_SYSCALL_64 at 0xffffffff96a001b1 arch/x86/entry/entry_64.S:238:0 Signed-off-by: Imran Khan <[email protected]>

…lock(s). We have ran into situtaions where optimistic spin on sleeping lock by multiple CPUs causes high sys load, which further leads to other issues. This helper allows to check for such spinners. Some examples from a vmcore where system ran into fork-bomb: >>> scan_osq_node(prog) There are spinners on one or more osq_lock CPU(s): [21, 17, 59, 67, 6, 0, 28, 53, 4, 41, 55, 38, 63, 23, 27, 19, 36] are spinning on same osq_lock CPU(s): [42, 56, 35, 18, 22, 3, 1] are spinning on same osq_lock CPU(s): [70, 44, 9] are spinning on same osq_lock CPU(s): [16, 26] are spinning on same osq_lock >>> scan_osq_node(prog,1) There are spinners on one or more osq_lock CPU(s): [21, 17, 59, 67, 6, 0, 28, 53, 4, 41, 55, 38, 63, 23, 27, 19, 36] are spinning on same osq_lock CPU: 21 has been spinning for 1.2 seconds. CPU: 17 has been spinning for 1.3 seconds. CPU: 59 has been spinning for 1.3 seconds. CPU: 67 has been spinning for 1.5 seconds. ....................................... ....................................... CPU: 19 has been spinning for 3.004 seconds. CPU: 36 has been spinning for 3.1 seconds. ...................................... >>> scan_osq_node(prog,2) There are spinners on one or more osq_lock CPU(s): [21, 17, 59, 67, 6, 0, 28, 53, 4, 41, 55, 38, 63, 23, 27, 19, 36] are spinning on same osq_lock CPU: 21 has been spinning for 0.0 seconds. Call stack at cpu: 21 PID: 64691 TASK: ffff8fac01282f80 [R] CPU: 21! COMMAND: "bash" !# 0 [ffffa447d645fb58] node_cpu at 0xffffffff960f3748 kernel/locking/osq_lock.c:27:0 !# 1 [ffffa447d645fb58] osq_lock at 0xffffffff960f3748 kernel/locking/osq_lock.c:143:0 # 2 [ffffa447d645fb68] rwsem_optimistic_spin at 0xffffffff96899cc0 kernel/locking/rwsem-xadd.c:451:0 # 3 [ffffa447d645fb68] __rwsem_down_write_failed_common at 0xffffffff96899cc0 kernel/locking/rwsem-xadd.c:529:0 # 4 [ffffa447d645fb68] rwsem_down_write_failed at 0xffffffff96899cc0 kernel/locking/rwsem-xadd.c:617:0 # 5 [ffffa447d645fbf8] call_rwsem_down_write_failed at 0xffffffff96889537 arch/x86/lib/rwsem.S:117:0 # 6 [ffffa447d645fc40] __down_write at 0xffffffff96898bcd arch/x86/include/asm/rwsem.h:142:0 # 7 [ffffa447d645fc40] down_write at 0xffffffff96898bcd kernel/locking/rwsem.c:72:0 # 8 [ffffa447d645fc58] lock_anon_vma_root at 0xffffffff9623ae3c mm/rmap.c:239:0 # 9 [ffffa447d645fc58] unlink_anon_vmas at 0xffffffff9623ae3c mm/rmap.c:390:0 #10 [ffffa447d645fca8] free_pgtables at 0xffffffff96225231 mm/memory.c:406:0 #11 [ffffa447d645fce8] exit_mmap at 0xffffffff96230f48 mm/mmap.c:3212:0 #12 [ffffa447d645fd98] __mmput at 0xffffffff96097ab2 kernel/fork.c:969:0 #13 [ffffa447d645fd98] mmput at 0xffffffff96097ab2 kernel/fork.c:990:0 #14 [ffffa447d645fdb8] copy_process at 0xffffffff96098801 kernel/fork.c:2058:0 #15 [ffffa447d645fea0] copy_process at 0xffffffff96099db9 kernel/fork.c:1653:0 #16 [ffffa447d645fea0] _do_fork at 0xffffffff96099db9 kernel/fork.c:2153:0 #17 [ffffa447d645ff20] SYSC_clone at 0xffffffff9609a149 kernel/fork.c:2265:0 #18 [ffffa447d645ff20] SyS_clone at 0xffffffff9609a149 kernel/fork.c:2259:0 #19 [ffffa447d645ff30] do_syscall_64 at 0xffffffff96003ca9 arch/x86/entry/common.c:298:0 #20 [ffffa447d645ff58] entry_SYSCALL_64 at 0xffffffff96a001b1 arch/x86/entry/entry_64.S:238:0 ....................................... ....................................... CPU: 36 has been spinning for 3.1 seconds. Call stack at cpu: 36 PID: 16329 TASK: ffff8f85db930000 [R] CPU: 36! COMMAND: bash 0 [ffffa4481243fb68] rwsem_try_write_lock_unqueued at 0xffffffff96899d00 kernel/locking/rwsem-xadd.c:364:0 1 [ffffa4481243fb68] rwsem_optimistic_spin at 0xffffffff96899d00 kernel/locking/rwsem-xadd.c:465:0 2 [ffffa4481243fb68] __rwsem_down_write_failed_common at 0xffffffff96899d00 kernel/locking/rwsem-xadd.c:529:0 3 [ffffa4481243fb68] rwsem_down_write_failed at 0xffffffff96899d00 kernel/locking/rwsem-xadd.c:617:0 # 4 [ffffa4481243fbf8] call_rwsem_down_write_failed at 0xffffffff96889537 arch/x86/lib/rwsem.S:117:0 # 5 [ffffa4481243fc40] __down_write at 0xffffffff96898bcd arch/x86/include/asm/rwsem.h:142:0 # 6 [ffffa4481243fc40] down_write at 0xffffffff96898bcd kernel/locking/rwsem.c:72:0 # 7 [ffffa4481243fc58] lock_anon_vma_root at 0xffffffff9623ae3c mm/rmap.c:239:0 # 8 [ffffa4481243fc58] unlink_anon_vmas at 0xffffffff9623ae3c mm/rmap.c:390:0 # 9 [ffffa4481243fca8] free_pgtables at 0xffffffff96225231 mm/memory.c:406:0 #10 [ffffa4481243fce8] exit_mmap at 0xffffffff96230f48 mm/mmap.c:3212:0 #11 [ffffa4481243fd98] __mmput at 0xffffffff96097ab2 kernel/fork.c:969:0 #12 [ffffa4481243fd98] mmput at 0xffffffff96097ab2 kernel/fork.c:990:0 #13 [ffffa4481243fdb8] copy_process at 0xffffffff96098801 kernel/fork.c:2058:0 #14 [ffffa4481243fea0] copy_process at 0xffffffff96099db9 kernel/fork.c:1653:0 #15 [ffffa4481243fea0] _do_fork at 0xffffffff96099db9 kernel/fork.c:2153:0 #16 [ffffa4481243ff20] SYSC_clone at 0xffffffff9609a149 kernel/fork.c:2265:0 #17 [ffffa4481243ff20] SyS_clone at 0xffffffff9609a149 kernel/fork.c:2259:0 #18 [ffffa4481243ff30] do_syscall_64 at 0xffffffff96003ca9 arch/x86/entry/common.c:298:0 #19 [ffffa4481243ff58] entry_SYSCALL_64 at 0xffffffff96a001b1 arch/x86/entry/entry_64.S:238:0 Signed-off-by: Imran Khan <[email protected]> Conflicts: drgn_tools/lock.py

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gtmoth force-pushed the drgn-tools-mounts branch 5 times, most recently from 8eb987a to 8717b75 Compare November 14, 2023 09:40

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gtmoth force-pushed the drgn-tools-mounts branch from 35d35d3 to dcf9f46 Compare November 29, 2023 12:07

Added mounts module

a1cb6c6

This module lists all the mount points from a given vmcore Signed-off-by: Gautham Ananthakrishna <[email protected]>

gtmoth force-pushed the drgn-tools-mounts branch from dcf9f46 to a1cb6c6 Compare November 29, 2023 12:18

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Added mounts module #17

Added mounts module #17

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brenns10 commented Nov 17, 2023

Added mounts module #17

Added mounts module #17

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