bisecting cause commit starting from 14240d4c5b25d087529691ccf4d7ea256f26cfdf building syzkaller on bca53db974f570410921f59b8c2c59a3d263cb44 testing commit 14240d4c5b25d087529691ccf4d7ea256f26cfdf with gcc (GCC) 8.1.0 kernel signature: fd174baf6b0ef249ae887a2cc1c161a5569486d8b211c355bd04b4d306ca3072 all runs: crashed: UBSAN: shift-out-of-bounds in chkSuper testing release v5.9 testing commit bbf5c979011a099af5dc76498918ed7df445635b with gcc (GCC) 8.1.0 kernel signature: 48a44b356059ba46606be11d05f4af2fd4977ae6064a111f191a24ab366037c1 all runs: crashed: UBSAN: shift-out-of-bounds in chkSuper testing release v5.8 testing commit bcf876870b95592b52519ed4aafcf9d95999bc9c with gcc (GCC) 8.1.0 kernel signature: 22aa95b7e7e6aea83bcbde6ee96bb510036c390ecb1edc1d673d8134021fdfef all runs: crashed: UBSAN: shift-out-of-bounds in chkSuper testing release v5.7 testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.1.0 kernel signature: f5d9faac2087b090050e744a65f37f315c08f987da9cd1b89f915d62396835a7 all runs: crashed: UBSAN: shift-out-of-bounds in chkSuper testing release v5.6 testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0 kernel signature: c44a15efe9f4dddfd3265e3ee72039e8fedc8e1a971752bf1b7899bdd24b69bf all runs: crashed: UBSAN: undefined-behaviour in chkSuper testing release v5.5 testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0 kernel signature: 0965e741efe2c9a43f96ed4ce7756181094148b594e50125c1ef55585450eb5a all runs: crashed: UBSAN: undefined-behaviour in chkSuper testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0 kernel signature: dc0e86cd1e84b0f0c4d2d664ac1a48c712bc8a201fcae8c2993a60e9b2ae998d all runs: crashed: UBSAN: undefined-behaviour in chkSuper testing release v5.3 testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0 kernel signature: b037b1dd21cfbbefec3369d9afc20b2628ba8eb7e83fdf09374888aacb7ba29f all runs: crashed: UBSAN: undefined-behaviour in chkSuper testing release v5.2 testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0 kernel signature: 93349bcc046589cc66751b3d8ad6ba9fb4ca2c06a1b85b534c498825df415deb all runs: OK # git bisect start 4d856f72c10ecb060868ed10ff1b1453943fc6c8 0ecfebd2b52404ae0c54a878c872bb93363ada36 Bisecting: 7848 revisions left to test after this (roughly 13 steps) [43c95d3694cc448fdf50bd53b7ff3a5bb4655883] Merge tag 'pinctrl-v5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl testing commit 43c95d3694cc448fdf50bd53b7ff3a5bb4655883 with gcc (GCC) 8.1.0 kernel signature: 4b747527b370f278b80d519a08704a1fc4ac66ba20bd6b27f495df0b418aff47 all runs: OK # git bisect good 43c95d3694cc448fdf50bd53b7ff3a5bb4655883 Bisecting: 3922 revisions left to test after this (roughly 12 steps) [0e2a5b5bd9a6aaec85df347dd71432a1d2d10763] Merge branch 'parisc-5.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/deller/parisc-linux testing commit 0e2a5b5bd9a6aaec85df347dd71432a1d2d10763 with gcc (GCC) 8.1.0 kernel signature: 06dcfd250fb274a9fe2fb07378c6eb8a4e95f2d219b45ef696d8b7c7d9a2cb11 all runs: OK # git bisect good 0e2a5b5bd9a6aaec85df347dd71432a1d2d10763 Bisecting: 1961 revisions left to test after this (roughly 11 steps) [12a6d2940b5f02b4b9f71ce098e3bb02bc24a9ea] perf record: Fix module size on s390 testing commit 12a6d2940b5f02b4b9f71ce098e3bb02bc24a9ea with gcc (GCC) 8.1.0 kernel signature: c4a5150bcf96ab1856acb6f19de3303af1db0fe4daaec11fc4c37746faa28403 all runs: OK # git bisect good 12a6d2940b5f02b4b9f71ce098e3bb02bc24a9ea Bisecting: 984 revisions left to test after this (roughly 10 steps) [85d8d3b172eb37b23dcdbe9fa7a85e343642bfea] Merge tag 'hyperv-fixes-signed' of git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux testing commit 85d8d3b172eb37b23dcdbe9fa7a85e343642bfea with gcc (GCC) 8.1.0 kernel signature: a6aaaa64abec79bd8cddb84ef667b4c604e7f718b70c2b19fcd42d00f5b29a58 all runs: OK # git bisect good 85d8d3b172eb37b23dcdbe9fa7a85e343642bfea Bisecting: 496 revisions left to test after this (roughly 9 steps) [6525771f58cbc6ab97b5cff9069865cde8283346] Merge tag 'arc-5.3-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/vgupta/arc testing commit 6525771f58cbc6ab97b5cff9069865cde8283346 with gcc (GCC) 8.1.0 kernel signature: 9a462afe28ae01e0cddc669c0d79ba61e80d3dbeb517e7d823252aadfad2fef2 all runs: OK # git bisect good 6525771f58cbc6ab97b5cff9069865cde8283346 Bisecting: 251 revisions left to test after this (roughly 8 steps) [345464fb760d1b772e891538b498e111c588b692] Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net testing commit 345464fb760d1b772e891538b498e111c588b692 with gcc (GCC) 8.1.0 kernel signature: e54ea1d71c5d55336ccad843207187169acce277788afbdc38229b71e384ba35 all runs: OK # git bisect good 345464fb760d1b772e891538b498e111c588b692 Bisecting: 126 revisions left to test after this (roughly 7 steps) [840ce8f8073edb3ff3d2c2c7a6ef211f4176961c] Merge tag 'pinctrl-v5.3-3' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-pinctrl testing commit 840ce8f8073edb3ff3d2c2c7a6ef211f4176961c with gcc (GCC) 8.1.0 kernel signature: 5176e552b56fc412de9aa6c7155bf64a72b4806cac3eaf5889f6a125f58500a0 all runs: OK # git bisect good 840ce8f8073edb3ff3d2c2c7a6ef211f4176961c Bisecting: 63 revisions left to test after this (roughly 6 steps) [c3dc1fa72249e4472b90ecef4dbafe25f0f07889] net: hns3: fix spelling mistake "undeflow" -> "underflow" testing commit c3dc1fa72249e4472b90ecef4dbafe25f0f07889 with gcc (GCC) 8.1.0 kernel signature: acca8820b52287eb6ab136b96f7357935c3b111e8ffa59d181bcfd8d7f63d811 all runs: OK # git bisect good c3dc1fa72249e4472b90ecef4dbafe25f0f07889 Bisecting: 30 revisions left to test after this (roughly 5 steps) [1c4c5e2528af0c803fb1171632074f4070229a75] Merge tag 'mmc-v5.3-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/ulfh/mmc testing commit 1c4c5e2528af0c803fb1171632074f4070229a75 with gcc (GCC) 8.1.0 kernel signature: 4720b3b1f30d6bd7c72df9bb807bf558b7f8b0b391cd7ed2325197277a38f14c all runs: OK # git bisect good 1c4c5e2528af0c803fb1171632074f4070229a75 Bisecting: 14 revisions left to test after this (roughly 4 steps) [ae3b06ed55b1554e9a91bf959c6b0b5e212e7f4d] Merge branch 'sctp_do_bind-leak' testing commit ae3b06ed55b1554e9a91bf959c6b0b5e212e7f4d with gcc (GCC) 8.1.0 kernel signature: 366456f3b8c39fdbd8245c177d13c9ffdf651f1b763593ba64dd095d25e8b68b all runs: OK # git bisect good ae3b06ed55b1554e9a91bf959c6b0b5e212e7f4d Bisecting: 8 revisions left to test after this (roughly 3 steps) [a9c20bb0206ae9384bd470a6832dd8913730add9] Merge tag 'kvm-s390-master-5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/kvms390/linux into kvm-master testing commit a9c20bb0206ae9384bd470a6832dd8913730add9 with gcc (GCC) 8.1.0 kernel signature: 9844f9dd31043678686e94dd0cad0803b33e539359de4b6b2642aa6bee34d3d5 all runs: OK # git bisect good a9c20bb0206ae9384bd470a6832dd8913730add9 Bisecting: 4 revisions left to test after this (roughly 2 steps) [b03c036e6f96340dd311817c7b964dad183c4141] Merge tag 'riscv/for-v5.3' of git://git.kernel.org/pub/scm/linux/kernel/git/riscv/linux testing commit b03c036e6f96340dd311817c7b964dad183c4141 with gcc (GCC) 8.1.0 kernel signature: 455a87b0b8032a1936c3a5417c6d6b6a65b2bb723b41b8bd591da6e4608412a0 all runs: OK # git bisect good b03c036e6f96340dd311817c7b964dad183c4141 Bisecting: 2 revisions left to test after this (roughly 1 step) [1f9c632cde0c3d781463a88ce430a8dd4a7c1a0e] Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost testing commit 1f9c632cde0c3d781463a88ce430a8dd4a7c1a0e with gcc (GCC) 8.1.0 kernel signature: 40ebb0c3b7bdaf4d95fe442214b53b7ed40e0e2fc8c7c67c63807a179506ccf3 all runs: OK # git bisect good 1f9c632cde0c3d781463a88ce430a8dd4a7c1a0e Bisecting: 0 revisions left to test after this (roughly 1 step) [72dbcf72156641fde4d8ea401e977341bfd35a05] Revert "ext4: make __ext4_get_inode_loc plug" testing commit 72dbcf72156641fde4d8ea401e977341bfd35a05 with gcc (GCC) 8.1.0 kernel signature: e2a5876546fd384f4774438d27bf3f3196e69eaa6f7ca06b296a46097fbb9302 all runs: OK # git bisect good 72dbcf72156641fde4d8ea401e977341bfd35a05 4d856f72c10ecb060868ed10ff1b1453943fc6c8 is the first bad commit commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 Author: Linus Torvalds Date: Sun Sep 15 14:19:32 2019 -0700 Linux 5.3 Makefile | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) culprit signature: b037b1dd21cfbbefec3369d9afc20b2628ba8eb7e83fdf09374888aacb7ba29f parent signature: e2a5876546fd384f4774438d27bf3f3196e69eaa6f7ca06b296a46097fbb9302 revisions tested: 23, total time: 4h52m26.751527847s (build: 2h4m36.992558625s, test: 2h45m14.537988256s) first bad commit: 4d856f72c10ecb060868ed10ff1b1453943fc6c8 Linux 5.3 recipients (to): ["linux-kbuild@vger.kernel.org" "michal.lkml@markovi.net" "torvalds@linux-foundation.org" "yamada.masahiro@socionext.com"] recipients (cc): ["linux-kernel@vger.kernel.org"] crash: UBSAN: undefined-behaviour in chkSuper ================================================================================ UBSAN: Undefined behaviour in fs/jfs/jfs_mount.c:372:25 shift exponent -9716 is negative CPU: 1 PID: 10716 Comm: syz-executor.1 Not tainted 5.3.0-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+0x86/0xca lib/dump_stack.c:113 ubsan_epilogue+0xd/0x3a lib/ubsan.c:158 __ubsan_handle_shift_out_of_bounds.cold.14+0x21/0x68 lib/ubsan.c:404 chkSuper.cold.1+0x22/0xbf fs/jfs/jfs_mount.c:372 jfs_mount+0x45/0x340 fs/jfs/jfs_mount.c:81 jfs_fill_super+0x526/0xb00 fs/jfs/super.c:560 mount_bdev+0x26f/0x330 fs/super.c:1283 jfs_do_mount+0x10/0x20 fs/jfs/super.c:674 legacy_get_tree+0x105/0x200 fs/fs_context.c:661 vfs_get_tree+0x86/0x3c0 fs/super.c:1413 do_new_mount fs/namespace.c:2791 [inline] do_mount+0x11da/0x1b90 fs/namespace.c:3111 ksys_mount+0xba/0xe0 fs/namespace.c:3320 __do_sys_mount fs/namespace.c:3334 [inline] __se_sys_mount fs/namespace.c:3331 [inline] __x64_sys_mount+0xb9/0x150 fs/namespace.c:3331 do_syscall_64+0x96/0x450 arch/x86/entry/common.c:296 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x460baa Code: b8 a6 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 ad 89 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 8a 89 fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007f2d4c007a78 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f2d4c007b10 RCX: 0000000000460baa RDX: 0000000020000000 RSI: 0000000020000080 RDI: 00007f2d4c007ad0 RBP: 00007f2d4c007ad0 R08: 00007f2d4c007b10 R09: 0000000020000000 R10: 0000000000000001 R11: 0000000000000246 R12: 0000000020000000 R13: 0000000020000080 R14: 0000000020000200 R15: 00000000200001c0 ================================================================================