bisecting fixing commit since 2f166cdcf8a92fcf85524f2b5526cb28e16f0a60 building syzkaller on abf9ba4fc75d9b29af15625d44dcfc1360fad3b7 testing commit 2f166cdcf8a92fcf85524f2b5526cb28e16f0a60 with gcc (GCC) 8.1.0 kernel signature: 16fc1dac30052161e217db775784be869b14a9cf7c7d81b0246d1f7aaf551674 run #0: crashed: WARNING in snd_pcm_drop run #1: crashed: WARNING in snd_pcm_drop run #2: crashed: WARNING in snd_pcm_drop run #3: crashed: WARNING: ODEBUG bug in exit_to_usermode_loop run #4: crashed: WARNING in snd_pcm_drop run #5: crashed: WARNING in snd_pcm_drop run #6: crashed: WARNING in snd_pcm_drop run #7: crashed: WARNING: ODEBUG bug in get_signal run #8: crashed: WARNING in snd_pcm_drop run #9: crashed: WARNING in snd_pcm_drop testing current HEAD bae31eef2a167ef160ab2703b6a2f5bbecd98d92 testing commit bae31eef2a167ef160ab2703b6a2f5bbecd98d92 with gcc (GCC) 8.1.0 kernel signature: 17229f098acb3f885a131363327acc5e0c57254ebb53cc80eb359f8efc5f8b83 all runs: OK # git bisect start bae31eef2a167ef160ab2703b6a2f5bbecd98d92 2f166cdcf8a92fcf85524f2b5526cb28e16f0a60 Bisecting: 169 revisions left to test after this (roughly 7 steps) [293036a0ea49b63a2dc449d41b6f81b3194fffeb] ehci-hcd: Move include to keep CRC stable testing commit 293036a0ea49b63a2dc449d41b6f81b3194fffeb with gcc (GCC) 8.1.0 kernel signature: 9957a9e0ab14e2fb2df976622d6a3fd0113f72ddefb1a5d34d1d680ddf6f77d2 all runs: OK # git bisect bad 293036a0ea49b63a2dc449d41b6f81b3194fffeb Bisecting: 84 revisions left to test after this (roughly 6 steps) [7290cb1a3aa67dcc43fecf66dae64eb2ebad18af] ARM: dts: BCM5301X: Fixed QSPI compatible string testing commit 7290cb1a3aa67dcc43fecf66dae64eb2ebad18af with gcc (GCC) 8.1.0 kernel signature: 59e0be1571036ea6e435a6fcc70768899ee42d0c2d3b7893eefba4483e334b03 all runs: OK # git bisect bad 7290cb1a3aa67dcc43fecf66dae64eb2ebad18af Bisecting: 42 revisions left to test after this (roughly 5 steps) [6aa022755fa184cde7c1af02f45357d7f483b1f7] uaccess: Add non-pagefault user-space write function testing commit 6aa022755fa184cde7c1af02f45357d7f483b1f7 with gcc (GCC) 8.1.0 kernel signature: e1c52d9d51df4f81653125b38f6b65a92b0242ebda3cba3f764b45336d9b91de all runs: OK # git bisect bad 6aa022755fa184cde7c1af02f45357d7f483b1f7 Bisecting: 20 revisions left to test after this (roughly 4 steps) [9de4fede0b351128162d4e3612b33e34352a66a5] net: hns: Fix memleak in hns_nic_dev_probe testing commit 9de4fede0b351128162d4e3612b33e34352a66a5 with gcc (GCC) 8.1.0 kernel signature: 434c5e03c94bb9ac4357362e06bee30c036ca658cf9d4e362b314e36372ea29f run #0: crashed: WARNING in snd_pcm_drop run #1: crashed: WARNING in snd_pcm_drop run #2: crashed: general protection fault in locks_remove_file run #3: crashed: WARNING in snd_pcm_drop run #4: crashed: WARNING in snd_pcm_drop run #5: crashed: WARNING in snd_pcm_drop run #6: crashed: WARNING in snd_pcm_drop run #7: crashed: WARNING in snd_pcm_drop run #8: crashed: general protection fault in locks_remove_file run #9: crashed: WARNING in snd_pcm_drop # git bisect good 9de4fede0b351128162d4e3612b33e34352a66a5 Bisecting: 10 revisions left to test after this (roughly 3 steps) [cfb5e057b7179767d6f3cef3381633417e4e3afb] net: ethernet: mlx4: Fix memory allocation in mlx4_buddy_init() testing commit cfb5e057b7179767d6f3cef3381633417e4e3afb with gcc (GCC) 8.1.0 kernel signature: 00c465c254725c3b15923e798f493955bfdd1dc29785f43978ddf732d284d41c run #0: crashed: WARNING: ODEBUG bug in exit_to_usermode_loop run #1: crashed: KASAN: use-after-free Read in snd_pcm_release run #2: crashed: WARNING in snd_pcm_drop run #3: crashed: WARNING in snd_pcm_drop run #4: crashed: WARNING in snd_pcm_drop run #5: crashed: WARNING in snd_pcm_drop run #6: crashed: WARNING: ODEBUG bug in exit_to_usermode_loop run #7: crashed: WARNING in snd_pcm_drop run #8: crashed: KASAN: use-after-free Read in snd_pcm_release run #9: crashed: WARNING in snd_pcm_drop # git bisect good cfb5e057b7179767d6f3cef3381633417e4e3afb Bisecting: 5 revisions left to test after this (roughly 3 steps) [5ace0847122fb22f18a20fb7809339cb3d789f01] include/linux/log2.h: add missing () around n in roundup_pow_of_two() testing commit 5ace0847122fb22f18a20fb7809339cb3d789f01 with gcc (GCC) 8.1.0 kernel signature: f1e3614f5f77deae70e204cf670e33205214775b61c493f19c05df9ab07eb601 all runs: OK # git bisect bad 5ace0847122fb22f18a20fb7809339cb3d789f01 Bisecting: 2 revisions left to test after this (roughly 1 step) [751deef5de35a497a3ea007e0953889ba1123a97] tg3: Fix soft lockup when tg3_reset_task() fails. testing commit 751deef5de35a497a3ea007e0953889ba1123a97 with gcc (GCC) 8.1.0 kernel signature: 1dd44376c29d418ce972f88fee2d28524a5baf9de39a5d9cae35e7bcd0fe88cc all runs: OK # git bisect bad 751deef5de35a497a3ea007e0953889ba1123a97 Bisecting: 0 revisions left to test after this (roughly 0 steps) [c5c6e00f6cc5d3ed0d6464b14e33f2f5c8505888] fix regression in "epoll: Keep a reference on files added to the check list" testing commit c5c6e00f6cc5d3ed0d6464b14e33f2f5c8505888 with gcc (GCC) 8.1.0 kernel signature: 5f5ffcd3b6b2bf46dced57162d97c13555e3e3c472eb50ccc0fc819b8ddc199a all runs: OK # git bisect bad c5c6e00f6cc5d3ed0d6464b14e33f2f5c8505888 c5c6e00f6cc5d3ed0d6464b14e33f2f5c8505888 is the first bad commit commit c5c6e00f6cc5d3ed0d6464b14e33f2f5c8505888 Author: Al Viro Date: Wed Sep 2 11:30:48 2020 -0400 fix regression in "epoll: Keep a reference on files added to the check list" [ Upstream commit 77f4689de17c0887775bb77896f4cc11a39bf848 ] epoll_loop_check_proc() can run into a file already committed to destruction; we can't grab a reference on those and don't need to add them to the set for reverse path check anyway. Tested-by: Marc Zyngier Fixes: a9ed4a6560b8 ("epoll: Keep a reference on files added to the check list") Signed-off-by: Al Viro Signed-off-by: Sasha Levin fs/eventpoll.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) culprit signature: 5f5ffcd3b6b2bf46dced57162d97c13555e3e3c472eb50ccc0fc819b8ddc199a parent signature: 00c465c254725c3b15923e798f493955bfdd1dc29785f43978ddf732d284d41c revisions tested: 10, total time: 2h45m58.758145403s (build: 1h27m33.204838895s, test: 1h17m5.836031383s) first good commit: c5c6e00f6cc5d3ed0d6464b14e33f2f5c8505888 fix regression in "epoll: Keep a reference on files added to the check list" recipients (to): ["maz@kernel.org" "sashal@kernel.org" "viro@zeniv.linux.org.uk"] recipients (cc): []