bisecting cause commit starting from 4e78c578cb987725eef1cec7d11b6437109e9a49 building syzkaller on 8bc4594f832068a30c0eff44d468311780057d1f testing commit 4e78c578cb987725eef1cec7d11b6437109e9a49 with gcc (GCC) 8.1.0 kernel signature: 739f818d39665bd64d08a81f674031b693e454e109b1076875680b54bd71e1fb all runs: crashed: possible deadlock in do_fcntl testing release v5.9 testing commit bbf5c979011a099af5dc76498918ed7df445635b with gcc (GCC) 8.1.0 kernel signature: 934f0a134532bbbd345c7e8b605e59600f755e76ac937b8aa8fb348b839f419b all runs: OK # git bisect start 4e78c578cb987725eef1cec7d11b6437109e9a49 bbf5c979011a099af5dc76498918ed7df445635b Bisecting: 9369 revisions left to test after this (roughly 13 steps) [4d0e9df5e43dba52d38b251e3b909df8fa1110be] lib, uaccess: add failure injection to usercopy functions testing commit 4d0e9df5e43dba52d38b251e3b909df8fa1110be with gcc (GCC) 8.1.0 kernel signature: f516cdde94a64662621805b57d241f61efba079163a3e86b24d39afe19b15a4c all runs: crashed: possible deadlock in do_fcntl # git bisect bad 4d0e9df5e43dba52d38b251e3b909df8fa1110be Bisecting: 3935 revisions left to test after this (roughly 12 steps) [f888bdf9823c85fe945c4eb3ba353f749dec3856] Merge tag 'devicetree-for-5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/robh/linux testing commit f888bdf9823c85fe945c4eb3ba353f749dec3856 with gcc (GCC) 8.1.0 kernel signature: a41270ebc1c7fc37844ceec11916736f39fc2437ad244f6a699031102a9084bc all runs: crashed: possible deadlock in do_fcntl # git bisect bad f888bdf9823c85fe945c4eb3ba353f749dec3856 Bisecting: 1997 revisions left to test after this (roughly 11 steps) [57218d7f2e87069f73c7a841b6ed6c1cc7acf616] Merge tag 'regmap-v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/regmap testing commit 57218d7f2e87069f73c7a841b6ed6c1cc7acf616 with gcc (GCC) 8.1.0 kernel signature: 62e98e4e62a1e7bd6ee42da29b9ec8477ae70fe2436eee69577390a9b755f777 all runs: crashed: possible deadlock in do_fcntl # git bisect bad 57218d7f2e87069f73c7a841b6ed6c1cc7acf616 Bisecting: 873 revisions left to test after this (roughly 10 steps) [39a5101f989e8d2be557136704d53990f9b402c8] Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 testing commit 39a5101f989e8d2be557136704d53990f9b402c8 with gcc (GCC) 8.1.0 kernel signature: 1374962090f587a10cecb0565e38d1a079378f2e8c2af9ca1a031b2d410ba858 all runs: crashed: possible deadlock in do_fcntl # git bisect bad 39a5101f989e8d2be557136704d53990f9b402c8 Bisecting: 521 revisions left to test after this (roughly 9 steps) [ed016af52ee3035b4799ebd7d53f9ae59d5782c4] Merge tag 'locking-core-2020-10-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip testing commit ed016af52ee3035b4799ebd7d53f9ae59d5782c4 with gcc (GCC) 8.1.0 kernel signature: 1090f57acd6737d3b74032dd7a1a6456ff204198b54c0fd5f3e07b0a5fca98f9 all runs: crashed: possible deadlock in do_fcntl # git bisect bad ed016af52ee3035b4799ebd7d53f9ae59d5782c4 Bisecting: 274 revisions left to test after this (roughly 8 steps) [f94ab231136c53ee26b1ddda76b29218018834ff] Merge tag 'x86_cleanups_for_v5.10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip testing commit f94ab231136c53ee26b1ddda76b29218018834ff with gcc (GCC) 8.1.0 kernel signature: db4c7ab135c53cd863aa4dba5a4b1ad3136654063805cff0d39dd16e4e2e1650 all runs: OK # git bisect good f94ab231136c53ee26b1ddda76b29218018834ff Bisecting: 125 revisions left to test after this (roughly 7 steps) [cc7343724eb77ce0752b1097a275f22f6fe47057] Merge tag 'x86-irq-2020-10-12' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip testing commit cc7343724eb77ce0752b1097a275f22f6fe47057 with gcc (GCC) 8.1.0 kernel signature: 996bdd9dd0e614858c9a5c565597521b1a54f6447c4f6740b87534fa8b36161f all runs: OK # git bisect good cc7343724eb77ce0752b1097a275f22f6fe47057 Bisecting: 61 revisions left to test after this (roughly 6 steps) [d6c4c11348816fb4d16e33bf47d559d7aa59350a] Merge branch 'kcsan' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into locking/core testing commit d6c4c11348816fb4d16e33bf47d559d7aa59350a with gcc (GCC) 8.1.0 kernel signature: f6216a9c1e050e4946f60dd097fcdd9cdfb14ca4d43a713adaf15bc12d43ed93 all runs: crashed: possible deadlock in do_fcntl # git bisect bad d6c4c11348816fb4d16e33bf47d559d7aa59350a Bisecting: 31 revisions left to test after this (roughly 5 steps) [6dd699b13d53f26a7603702d8bada3482312df74] seqlock: seqcount_LOCKNAME_t: Standardize naming convention testing commit 6dd699b13d53f26a7603702d8bada3482312df74 with gcc (GCC) 8.1.0 kernel signature: 3c2d11c8ba005ac47133d69aedf713c80485c30fd883f805ac591db2f5d70f4a all runs: crashed: possible deadlock in do_fcntl # git bisect bad 6dd699b13d53f26a7603702d8bada3482312df74 Bisecting: 15 revisions left to test after this (roughly 4 steps) [621c9dac0eea7607cb9a57cc9ba47fbcd4e644c9] lockdep: Add recursive read locks into dependency graph testing commit 621c9dac0eea7607cb9a57cc9ba47fbcd4e644c9 with gcc (GCC) 8.1.0 kernel signature: 2357a0d5e6ec0a1aa85004bd9d2f14e0dc0185ff005c4cb68bcaa5c63bb2e4b3 all runs: crashed: possible deadlock in do_fcntl # git bisect bad 621c9dac0eea7607cb9a57cc9ba47fbcd4e644c9 Bisecting: 7 revisions left to test after this (roughly 3 steps) [d563bc6ead9e79be37067d58509a605b67378184] lockdep: Make __bfs() visit every dependency until a match testing commit d563bc6ead9e79be37067d58509a605b67378184 with gcc (GCC) 8.1.0 kernel signature: 81cea1bd102c682f01caf4e4e748e204d008934a737fcfa3bca0204d87c0d0d9 all runs: crashed: possible deadlock in do_fcntl # git bisect bad d563bc6ead9e79be37067d58509a605b67378184 Bisecting: 3 revisions left to test after this (roughly 2 steps) [92b4e9f11a636d1723cc0866bf8b9111b1e24339] Documentation/locking/locktypes: Fix local_locks documentation testing commit 92b4e9f11a636d1723cc0866bf8b9111b1e24339 with gcc (GCC) 8.1.0 kernel signature: 4c8fc504e56c2ad2b2856da9628c3f663b061f4dbdecf72c32596665385cab4e all runs: OK # git bisect good 92b4e9f11a636d1723cc0866bf8b9111b1e24339 Bisecting: 1 revision left to test after this (roughly 1 step) [224ec489d3cdb0af6794e257eeee39d98dc9c5b2] lockdep/Documention: Recursive read lock detection reasoning testing commit 224ec489d3cdb0af6794e257eeee39d98dc9c5b2 with gcc (GCC) 8.1.0 kernel signature: 9f9268efaebaf6fda2578f2ad9599e0825b920284efce893ce4b22a9ac086d1d all runs: crashed: possible deadlock in do_fcntl # git bisect bad 224ec489d3cdb0af6794e257eeee39d98dc9c5b2 Bisecting: 0 revisions left to test after this (roughly 0 steps) [e918188611f073063415f40fae568fa4d86d9044] locking: More accurate annotations for read_lock() testing commit e918188611f073063415f40fae568fa4d86d9044 with gcc (GCC) 8.1.0 kernel signature: 9f9268efaebaf6fda2578f2ad9599e0825b920284efce893ce4b22a9ac086d1d all runs: crashed: possible deadlock in do_fcntl # git bisect bad e918188611f073063415f40fae568fa4d86d9044 e918188611f073063415f40fae568fa4d86d9044 is the first bad commit commit e918188611f073063415f40fae568fa4d86d9044 Author: Boqun Feng Date: Fri Aug 7 15:42:20 2020 +0800 locking: More accurate annotations for read_lock() On the archs using QUEUED_RWLOCKS, read_lock() is not always a recursive read lock, actually it's only recursive if in_interrupt() is true. So change the annotation accordingly to catch more deadlocks. Note we used to treat read_lock() as pure recursive read locks in lib/locking-seftest.c, and this is useful, especially for the lockdep development selftest, so we keep this via a variable to force switching lock annotation for read_lock(). Signed-off-by: Boqun Feng Signed-off-by: Peter Zijlstra (Intel) Link: https://lkml.kernel.org/r/20200807074238.1632519-2-boqun.feng@gmail.com include/linux/lockdep.h | 23 ++++++++++++++++++++++- kernel/locking/lockdep.c | 14 ++++++++++++++ lib/locking-selftest.c | 11 +++++++++++ 3 files changed, 47 insertions(+), 1 deletion(-) culprit signature: 9f9268efaebaf6fda2578f2ad9599e0825b920284efce893ce4b22a9ac086d1d parent signature: 4c8fc504e56c2ad2b2856da9628c3f663b061f4dbdecf72c32596665385cab4e revisions tested: 16, total time: 2h33m48.518977955s (build: 1h17m36.128380174s, test: 1h14m40.516479506s) first bad commit: e918188611f073063415f40fae568fa4d86d9044 locking: More accurate annotations for read_lock() recipients (to): ["boqun.feng@gmail.com" "linux-kernel@vger.kernel.org" "mingo@redhat.com" "peterz@infradead.org" "peterz@infradead.org" "will@kernel.org"] recipients (cc): [] crash: possible deadlock in do_fcntl ======================================================== WARNING: possible irq lock inversion dependency detected 5.9.0-rc2-syzkaller #0 Not tainted -------------------------------------------------------- syz-executor.1/10183 just changed the state of lock: ffff88812f4cdf38 (&f->f_owner.lock){.+..}-{2:2}, at: f_getown_ex fs/fcntl.c:206 [inline] ffff88812f4cdf38 (&f->f_owner.lock){.+..}-{2:2}, at: do_fcntl+0x5bb/0x780 fs/fcntl.c:387 but this lock was taken by another, HARDIRQ-safe lock in the past: (&dev->event_lock){-...}-{2:2} and interrupts could create inverse lock ordering between them. other info that might help us debug this: Chain exists of: &dev->event_lock --> &new->fa_lock --> &f->f_owner.lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&f->f_owner.lock); local_irq_disable(); lock(&dev->event_lock); lock(&new->fa_lock); lock(&dev->event_lock); *** DEADLOCK *** no locks held by syz-executor.1/10183. the shortest dependencies between 2nd lock and 1st lock: -> (&dev->event_lock){-...}-{2:2} { IN-HARDIRQ-W at: lock_acquire+0xb0/0x3a0 kernel/locking/lockdep.c:5020 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x33/0x50 kernel/locking/spinlock.c:159 input_event+0x33/0x70 drivers/input/input.c:440 input_report_key include/linux/input.h:417 [inline] psmouse_report_standard_buttons+0x1b/0x50 drivers/input/mouse/psmouse-base.c:123 psmouse_report_standard_packet drivers/input/mouse/psmouse-base.c:141 [inline] psmouse_process_byte+0x70/0x260 drivers/input/mouse/psmouse-base.c:232 psmouse_handle_byte+0xa/0x50 drivers/input/mouse/psmouse-base.c:274 psmouse_interrupt+0xc5/0x3f0 drivers/input/mouse/psmouse-base.c:426 serio_interrupt+0x3b/0x80 drivers/input/serio/serio.c:1002 i8042_interrupt+0x153/0x280 drivers/input/serio/i8042.c:598 __handle_irq_event_percpu+0x3c/0x320 kernel/irq/handle.c:156 handle_irq_event_percpu+0x2b/0x70 kernel/irq/handle.c:196 handle_irq_event+0x2f/0x4c kernel/irq/handle.c:213 handle_edge_irq+0x8f/0x1b0 kernel/irq/chip.c:819 asm_call_on_stack+0xf/0x20 arch/x86/entry/entry_64.S:706 __run_on_irqstack arch/x86/include/asm/irq_stack.h:22 [inline] run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:48 [inline] handle_irq arch/x86/kernel/irq.c:230 [inline] __common_interrupt arch/x86/kernel/irq.c:249 [inline] common_interrupt+0x159/0x220 arch/x86/kernel/irq.c:239 asm_common_interrupt+0x1e/0x40 arch/x86/include/asm/idtentry.h:572 native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline] arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:160 [inline] _raw_spin_unlock_irqrestore+0x25/0x50 kernel/locking/spinlock.c:191 spin_unlock_irqrestore include/linux/spinlock.h:409 [inline] i8042_command+0x35/0x40 drivers/input/serio/i8042.c:348 i8042_aux_write+0x29/0x30 drivers/input/serio/i8042.c:383 serio_write include/linux/serio.h:125 [inline] ps2_do_sendbyte+0xb3/0x260 drivers/input/serio/libps2.c:40 ps2_sendbyte+0x31/0x80 drivers/input/serio/libps2.c:92 cypress_ps2_sendbyte+0x15/0x70 drivers/input/mouse/cypress_ps2.c:42 cypress_ps2_read_cmd_status drivers/input/mouse/cypress_ps2.c:116 [inline] cypress_send_ext_cmd+0xff/0x430 drivers/input/mouse/cypress_ps2.c:189 cypress_detect+0x27/0x80 drivers/input/mouse/cypress_ps2.c:205 psmouse_do_detect+0x2a/0x50 drivers/input/mouse/psmouse-base.c:1009 psmouse_try_protocol+0xb1/0x170 drivers/input/mouse/psmouse-base.c:1023 psmouse_extensions+0x1f6/0x420 drivers/input/mouse/psmouse-base.c:1146 psmouse_switch_protocol+0x145/0x1f0 drivers/input/mouse/psmouse-base.c:1542 psmouse_connect+0x1b7/0x370 drivers/input/mouse/psmouse-base.c:1632 serio_connect_driver+0x24/0x40 drivers/input/serio/serio.c:47 really_probe+0xd1/0x400 drivers/base/dd.c:553 driver_probe_device+0xd9/0x140 drivers/base/dd.c:738 device_driver_attach+0x4a/0x50 drivers/base/dd.c:1013 __driver_attach+0x80/0x140 drivers/base/dd.c:1090 bus_for_each_dev+0x71/0xb0 drivers/base/bus.c:305 serio_attach_driver drivers/input/serio/serio.c:808 [inline] serio_handle_event+0x1ee/0x250 drivers/input/serio/serio.c:227 process_one_work+0x26a/0x5f0 kernel/workqueue.c:2269 worker_thread+0x38/0x380 kernel/workqueue.c:2415 kthread+0x147/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 INITIAL USE at: lock_acquire+0xb0/0x3a0 kernel/locking/lockdep.c:5020 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:110 [inline] _raw_spin_lock_irqsave+0x33/0x50 kernel/locking/spinlock.c:159 input_inject_event+0x44/0x1b6 drivers/input/input.c:466 led_trigger_event+0x3c/0x60 drivers/leds/led-triggers.c:387 kbd_led_trigger_activate+0x4b/0x60 drivers/tty/vt/keyboard.c:1005 led_trigger_set+0x1fc/0x300 drivers/leds/led-triggers.c:195 led_trigger_set_default+0x8b/0xb0 drivers/leds/led-triggers.c:259 led_classdev_register_ext+0x23d/0x310 drivers/leds/led-class.c:412 led_classdev_register include/linux/leds.h:190 [inline] input_leds_connect+0x177/0x2ff drivers/input/input-leds.c:139 input_attach_handler+0x68/0x90 drivers/input/input.c:1031 input_register_device.cold.22+0xa4/0x152 drivers/input/input.c:2229 atkbd_connect+0x214/0x30e drivers/input/keyboard/atkbd.c:1293 serio_connect_driver+0x24/0x40 drivers/input/serio/serio.c:47 really_probe+0xd1/0x400 drivers/base/dd.c:553 driver_probe_device+0xd9/0x140 drivers/base/dd.c:738 device_driver_attach+0x4a/0x50 drivers/base/dd.c:1013 __driver_attach+0x80/0x140 drivers/base/dd.c:1090 bus_for_each_dev+0x71/0xb0 drivers/base/bus.c:305 serio_attach_driver drivers/input/serio/serio.c:808 [inline] serio_handle_event+0x1ee/0x250 drivers/input/serio/serio.c:227 process_one_work+0x26a/0x5f0 kernel/workqueue.c:2269 worker_thread+0x38/0x380 kernel/workqueue.c:2415 kthread+0x147/0x170 kernel/kthread.c:292 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:294 } ... key at: [] __key.34105+0x0/0x10 ... acquired at: __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] evdev_pass_values+0x71/0x280 drivers/input/evdev.c:262 evdev_events+0xf7/0x1a0 drivers/input/evdev.c:307 input_to_handler+0x83/0xe0 drivers/input/input.c:115 input_pass_values.part.8+0x1b0/0x260 drivers/input/input.c:145 input_pass_values drivers/input/input.c:134 [inline] input_handle_event+0x4cf/0x5f0 drivers/input/input.c:399 input_inject_event+0x14f/0x1b6 drivers/input/input.c:471 evdev_write+0x136/0x230 drivers/input/evdev.c:530 vfs_write+0xc7/0x230 fs/read_write.c:576 ksys_write+0xb9/0xd0 fs/read_write.c:631 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> (&client->buffer_lock){....}-{2:2} { INITIAL USE at: lock_acquire+0xb0/0x3a0 kernel/locking/lockdep.c:5020 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline] _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:354 [inline] evdev_pass_values+0x71/0x280 drivers/input/evdev.c:262 evdev_events+0xf7/0x1a0 drivers/input/evdev.c:307 input_to_handler+0x83/0xe0 drivers/input/input.c:115 input_pass_values.part.8+0x1b0/0x260 drivers/input/input.c:145 input_pass_values drivers/input/input.c:134 [inline] input_handle_event+0x4cf/0x5f0 drivers/input/input.c:399 input_inject_event+0x14f/0x1b6 drivers/input/input.c:471 evdev_write+0x136/0x230 drivers/input/evdev.c:530 vfs_write+0xc7/0x230 fs/read_write.c:576 ksys_write+0xb9/0xd0 fs/read_write.c:631 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 } ... key at: [] __key.36392+0x0/0x10 ... acquired at: __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1002 [inline] kill_fasync+0xa7/0x200 fs/fcntl.c:1023 __pass_event drivers/input/evdev.c:240 [inline] evdev_pass_values+0x18a/0x280 drivers/input/evdev.c:279 evdev_events+0xf7/0x1a0 drivers/input/evdev.c:307 input_to_handler+0x83/0xe0 drivers/input/input.c:115 input_pass_values.part.8+0x1b0/0x260 drivers/input/input.c:145 input_pass_values drivers/input/input.c:134 [inline] input_handle_event+0x4cf/0x5f0 drivers/input/input.c:399 input_inject_event+0x14f/0x1b6 drivers/input/input.c:471 evdev_write+0x136/0x230 drivers/input/evdev.c:530 vfs_write+0xc7/0x230 fs/read_write.c:576 ksys_write+0xb9/0xd0 fs/read_write.c:631 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> (&new->fa_lock){....}-{2:2} { INITIAL USE at: lock_acquire+0xb0/0x3a0 kernel/locking/lockdep.c:5020 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223 kill_fasync_rcu fs/fcntl.c:1002 [inline] kill_fasync+0xa7/0x200 fs/fcntl.c:1023 __pass_event drivers/input/evdev.c:240 [inline] evdev_pass_values+0x18a/0x280 drivers/input/evdev.c:279 evdev_events+0xf7/0x1a0 drivers/input/evdev.c:307 input_to_handler+0x83/0xe0 drivers/input/input.c:115 input_pass_values.part.8+0x1b0/0x260 drivers/input/input.c:145 input_pass_values drivers/input/input.c:134 [inline] input_handle_event+0x4cf/0x5f0 drivers/input/input.c:399 input_inject_event+0x14f/0x1b6 drivers/input/input.c:471 evdev_write+0x136/0x230 drivers/input/evdev.c:530 vfs_write+0xc7/0x230 fs/read_write.c:576 ksys_write+0xb9/0xd0 fs/read_write.c:631 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 } ... key at: [] __key.45767+0x0/0x10 ... acquired at: __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223 send_sigio+0x23/0x200 fs/fcntl.c:786 kill_fasync_rcu fs/fcntl.c:1009 [inline] kill_fasync+0xd2/0x200 fs/fcntl.c:1023 __pass_event drivers/input/evdev.c:240 [inline] evdev_pass_values+0x18a/0x280 drivers/input/evdev.c:279 evdev_events+0xf7/0x1a0 drivers/input/evdev.c:307 input_to_handler+0x83/0xe0 drivers/input/input.c:115 input_pass_values.part.8+0x1b0/0x260 drivers/input/input.c:145 input_pass_values drivers/input/input.c:134 [inline] input_handle_event+0x4cf/0x5f0 drivers/input/input.c:399 input_inject_event+0x14f/0x1b6 drivers/input/input.c:471 evdev_write+0x136/0x230 drivers/input/evdev.c:530 vfs_write+0xc7/0x230 fs/read_write.c:576 ksys_write+0xb9/0xd0 fs/read_write.c:631 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 -> (&f->f_owner.lock){.+..}-{2:2} { HARDIRQ-ON-R at: lock_acquire+0xb0/0x3a0 kernel/locking/lockdep.c:5020 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223 f_getown_ex fs/fcntl.c:206 [inline] do_fcntl+0x5bb/0x780 fs/fcntl.c:387 __do_sys_fcntl fs/fcntl.c:463 [inline] __se_sys_fcntl fs/fcntl.c:448 [inline] __x64_sys_fcntl+0x89/0xb0 fs/fcntl.c:448 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 INITIAL USE at: lock_acquire+0xb0/0x3a0 kernel/locking/lockdep.c:5020 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223 send_sigio+0x23/0x200 fs/fcntl.c:786 kill_fasync_rcu fs/fcntl.c:1009 [inline] kill_fasync+0xd2/0x200 fs/fcntl.c:1023 __pass_event drivers/input/evdev.c:240 [inline] evdev_pass_values+0x18a/0x280 drivers/input/evdev.c:279 evdev_events+0xf7/0x1a0 drivers/input/evdev.c:307 input_to_handler+0x83/0xe0 drivers/input/input.c:115 input_pass_values.part.8+0x1b0/0x260 drivers/input/input.c:145 input_pass_values drivers/input/input.c:134 [inline] input_handle_event+0x4cf/0x5f0 drivers/input/input.c:399 input_inject_event+0x14f/0x1b6 drivers/input/input.c:471 evdev_write+0x136/0x230 drivers/input/evdev.c:530 vfs_write+0xc7/0x230 fs/read_write.c:576 ksys_write+0xb9/0xd0 fs/read_write.c:631 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 } ... key at: [] __key.49897+0x0/0x10 ... acquired at: mark_lock_irq kernel/locking/lockdep.c:3568 [inline] mark_lock+0x24f/0x850 kernel/locking/lockdep.c:4006 mark_usage kernel/locking/lockdep.c:3911 [inline] __lock_acquire+0x874/0x2ad0 kernel/locking/lockdep.c:4380 lock_acquire+0xb0/0x3a0 kernel/locking/lockdep.c:5020 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223 f_getown_ex fs/fcntl.c:206 [inline] do_fcntl+0x5bb/0x780 fs/fcntl.c:387 __do_sys_fcntl fs/fcntl.c:463 [inline] __se_sys_fcntl fs/fcntl.c:448 [inline] __x64_sys_fcntl+0x89/0xb0 fs/fcntl.c:448 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 stack backtrace: CPU: 0 PID: 10183 Comm: syz-executor.1 Not tainted 5.9.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x77/0xa0 lib/dump_stack.c:118 print_irq_inversion_bug kernel/locking/lockdep.c:3429 [inline] check_usage_backwards.cold.63+0x1d/0x26 kernel/locking/lockdep.c:3480 mark_lock_irq kernel/locking/lockdep.c:3568 [inline] mark_lock+0x24f/0x850 kernel/locking/lockdep.c:4006 mark_usage kernel/locking/lockdep.c:3911 [inline] __lock_acquire+0x874/0x2ad0 kernel/locking/lockdep.c:4380 lock_acquire+0xb0/0x3a0 kernel/locking/lockdep.c:5020 __raw_read_lock include/linux/rwlock_api_smp.h:149 [inline] _raw_read_lock+0x5b/0x70 kernel/locking/spinlock.c:223 f_getown_ex fs/fcntl.c:206 [inline] do_fcntl+0x5bb/0x780 fs/fcntl.c:387 __do_sys_fcntl fs/fcntl.c:463 [inline] __se_sys_fcntl fs/fcntl.c:448 [inline] __x64_sys_fcntl+0x89/0xb0 fs/fcntl.c:448 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x45deb9 Code: 0d b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 db b3 fb ff c3 66 2e 0f 1f 84 00 00 00 00 RSP: 002b:00007f2a96ed8c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000048 RAX: ffffffffffffffda RBX: 0000000000003340 RCX: 000000000045deb9 RDX: 0000000000000000 RSI: 0000000000000010 RDI: 0000000000000006 RBP: 000000000118bf60 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000118bf2c R13: 00007ffe393495ff R14: 00007f2a96ed99c0 R15: 000000000118bf2c