bisecting fixing commit since f6d5cb9e2c06f7d583dd9f4f7cca21d13d78c32a building syzkaller on abf9ba4fc75d9b29af15625d44dcfc1360fad3b7 testing commit f6d5cb9e2c06f7d583dd9f4f7cca21d13d78c32a with gcc (GCC) 8.1.0 kernel signature: 540efdec368a021f1e324fbd52fd7b5494d3296e58615d747f3640cc3ce19d47 run #0: crashed: WARNING: ODEBUG bug in exit_to_usermode_loop run #1: crashed: kernel BUG at include/linux/fs.h:LINE! run #2: crashed: kernel BUG at include/linux/fs.h:LINE! run #3: crashed: kernel BUG at include/linux/fs.h:LINE! run #4: crashed: kernel BUG at include/linux/fs.h:LINE! run #5: crashed: kernel BUG at include/linux/fs.h:LINE! run #6: crashed: WARNING: ODEBUG bug in exit_to_usermode_loop run #7: crashed: kernel BUG at include/linux/fs.h:LINE! run #8: crashed: WARNING: ODEBUG bug in exit_to_usermode_loop run #9: crashed: kernel BUG at include/linux/fs.h:LINE! testing current HEAD b09c34517e1ac4018e3bb75ed5c8610a8a1f486b testing commit b09c34517e1ac4018e3bb75ed5c8610a8a1f486b with gcc (GCC) 8.1.0 kernel signature: c3b696ca7ba2bd2f06d70160eef1e279ddc2f729751cc738fd589ea77c1335e2 all runs: OK # git bisect start b09c34517e1ac4018e3bb75ed5c8610a8a1f486b f6d5cb9e2c06f7d583dd9f4f7cca21d13d78c32a Bisecting: 316 revisions left to test after this (roughly 8 steps) [61279a7b3e337b8c8605987591964db4a2b3eb91] SUNRPC: stop printk reading past end of string testing commit 61279a7b3e337b8c8605987591964db4a2b3eb91 with gcc (GCC) 8.1.0 kernel signature: 1f30824b35ecc9c61c7fa51d2032d1da1af8d709f38560bd838191b1d08571de all runs: OK # git bisect bad 61279a7b3e337b8c8605987591964db4a2b3eb91 Bisecting: 158 revisions left to test after this (roughly 7 steps) [9895dfea9610ae54be8890b98eb17fd7f1496c75] bnxt_en: Fix PCI AER error recovery flow testing commit 9895dfea9610ae54be8890b98eb17fd7f1496c75 with gcc (GCC) 8.1.0 kernel signature: bf33c71f67a58dc503bc0d93facc399c7dc07f074d872eaffc3c5fb0c4206ee5 run #0: crashed: kernel BUG at include/linux/fs.h:LINE! run #1: crashed: WARNING: ODEBUG bug in corrupted run #2: crashed: kernel BUG at include/linux/fs.h:LINE! run #3: crashed: kernel BUG at include/linux/fs.h:LINE! run #4: crashed: kernel BUG at include/linux/fs.h:LINE! run #5: crashed: kernel BUG at include/linux/fs.h:LINE! run #6: crashed: kernel BUG at include/linux/fs.h:LINE! run #7: crashed: WARNING: ODEBUG bug in exit_to_usermode_loop run #8: crashed: KASAN: use-after-free Read in binder_defer_work run #9: crashed: kernel BUG at include/linux/fs.h:LINE! # git bisect good 9895dfea9610ae54be8890b98eb17fd7f1496c75 Bisecting: 79 revisions left to test after this (roughly 6 steps) [d2dd6d5a77c5dbee03a5ffe75811f6e906599df4] arm64: dts: ns2: Fixed QSPI compatible string testing commit d2dd6d5a77c5dbee03a5ffe75811f6e906599df4 with gcc (GCC) 8.1.0 kernel signature: 400879b9855bb0c72c31210d00d6f95ebb03c4c18d9126863676d0d942f032de all runs: OK # git bisect bad d2dd6d5a77c5dbee03a5ffe75811f6e906599df4 Bisecting: 39 revisions left to test after this (roughly 5 steps) [b0a689f84d53a8b923302cfab10527ada27d962c] affs: fix basic permission bits to actually work testing commit b0a689f84d53a8b923302cfab10527ada27d962c with gcc (GCC) 8.1.0 kernel signature: 4073c0e076d61364912c6b02119372af967160fd784de94e8101f4c82e0ebc9d all runs: OK # git bisect bad b0a689f84d53a8b923302cfab10527ada27d962c Bisecting: 19 revisions left to test after this (roughly 4 steps) [884fee7632168ab59ed49a26de430fa3ed5c6a86] xfs: don't update mtime on COW faults testing commit 884fee7632168ab59ed49a26de430fa3ed5c6a86 with gcc (GCC) 8.1.0 kernel signature: 0d581893d4caf95764c426068ef2263baed971bc4d7a4ea61cbf8c8fbdeef4f3 all runs: OK # git bisect bad 884fee7632168ab59ed49a26de430fa3ed5c6a86 Bisecting: 9 revisions left to test after this (roughly 3 steps) [37d933e8b41b83bb8278815e366aec5a542b7e31] fix regression in "epoll: Keep a reference on files added to the check list" testing commit 37d933e8b41b83bb8278815e366aec5a542b7e31 with gcc (GCC) 8.1.0 kernel signature: 5726f8c199e11c12d96688085e392679dc492f9d29533738438dec11da572f61 all runs: OK # git bisect bad 37d933e8b41b83bb8278815e366aec5a542b7e31 Bisecting: 4 revisions left to test after this (roughly 2 steps) [0430561c8e0f4b497b29a169445e2477c607e27b] selftests/bpf: Fix massive output from test_maps testing commit 0430561c8e0f4b497b29a169445e2477c607e27b with gcc (GCC) 8.1.0 kernel signature: 3c99b973265a9f57a892ce2614d244db156e90c5052d9badf2fc863b418dd756 run #0: crashed: kernel BUG at include/linux/fs.h:LINE! run #1: crashed: kernel BUG at include/linux/fs.h:LINE! run #2: crashed: kernel BUG at include/linux/fs.h:LINE! run #3: crashed: kernel BUG at include/linux/fs.h:LINE! run #4: crashed: kernel BUG at include/linux/fs.h:LINE! run #5: crashed: kernel BUG at include/linux/fs.h:LINE! run #6: crashed: kernel BUG at include/linux/fs.h:LINE! run #7: crashed: kernel BUG at include/linux/fs.h:LINE! run #8: crashed: kernel BUG at include/linux/fs.h:LINE! run #9: crashed: WARNING: ODEBUG bug in exit_to_usermode_loop # git bisect good 0430561c8e0f4b497b29a169445e2477c607e27b Bisecting: 2 revisions left to test after this (roughly 1 step) [dff6a2c2828bce13f32c62029def97195f8830f6] nvmet-fc: Fix a missed _irqsave version of spin_lock in 'nvmet_fc_fod_op_done()' testing commit dff6a2c2828bce13f32c62029def97195f8830f6 with gcc (GCC) 8.1.0 kernel signature: b6ce347429a6aa156fc3e1d313955eea164014f23b4aae638391e0d8d8dd3822 run #0: crashed: kernel BUG at include/linux/fs.h:LINE! run #1: crashed: kernel BUG at include/linux/fs.h:LINE! run #2: crashed: kernel BUG at include/linux/fs.h:LINE! run #3: crashed: kernel BUG at include/linux/fs.h:LINE! run #4: crashed: kernel BUG at include/linux/fs.h:LINE! run #5: crashed: kernel BUG at include/linux/fs.h:LINE! run #6: crashed: WARNING: ODEBUG bug in exit_to_usermode_loop run #7: crashed: WARNING: ODEBUG bug in exit_to_usermode_loop run #8: crashed: kernel BUG at include/linux/fs.h:LINE! run #9: crashed: kernel BUG at include/linux/fs.h:LINE! # git bisect good dff6a2c2828bce13f32c62029def97195f8830f6 Bisecting: 0 revisions left to test after this (roughly 1 step) [f00d82c3fb4368afb41cba89b287801a7888627c] net: ethernet: mlx4: Fix memory allocation in mlx4_buddy_init() testing commit f00d82c3fb4368afb41cba89b287801a7888627c with gcc (GCC) 8.1.0 kernel signature: 32bc418e387d85bd69d657d3e206b7265371de14b6df255a2cc193e246c456ac run #0: crashed: WARNING: ODEBUG bug in exit_to_usermode_loop run #1: crashed: kernel BUG at include/linux/fs.h:LINE! run #2: crashed: kernel BUG at include/linux/fs.h:LINE! run #3: crashed: kernel BUG at include/linux/fs.h:LINE! run #4: crashed: WARNING: ODEBUG bug in exit_to_usermode_loop run #5: crashed: kernel BUG at include/linux/fs.h:LINE! run #6: crashed: WARNING: ODEBUG bug in exit_to_usermode_loop run #7: crashed: kernel BUG at include/linux/fs.h:LINE! run #8: crashed: kernel BUG at include/linux/fs.h:LINE! run #9: crashed: kernel BUG at include/linux/fs.h:LINE! # git bisect good f00d82c3fb4368afb41cba89b287801a7888627c 37d933e8b41b83bb8278815e366aec5a542b7e31 is the first bad commit commit 37d933e8b41b83bb8278815e366aec5a542b7e31 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: 5726f8c199e11c12d96688085e392679dc492f9d29533738438dec11da572f61 parent signature: 32bc418e387d85bd69d657d3e206b7265371de14b6df255a2cc193e246c456ac revisions tested: 11, total time: 2h54m0.062382541s (build: 1h39m45.270588588s, test: 1h12m49.24708617s) first good commit: 37d933e8b41b83bb8278815e366aec5a542b7e31 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): []