bisecting cause commit starting from 7cc2a8ea104820dd9e702202621e8fd4d9f6c8cf building syzkaller on 510951950dc0ee69cfdaf746061d3dbe31b49fd8 testing commit 7cc2a8ea104820dd9e702202621e8fd4d9f6c8cf with gcc (GCC) 8.1.0 kernel signature: c1ffb040f0954f6d618d5754151c147aefb54075a0cde146919a662fabd80fea run #0: crashed: INFO: rcu detected stall in sys_clock_settime run #1: crashed: INFO: rcu detected stall in sys_clock_settime run #2: crashed: INFO: rcu detected stall in sys_clock_settime run #3: crashed: INFO: rcu detected stall in _get_random_bytes run #4: crashed: INFO: rcu detected stall in sys_clock_settime run #5: crashed: INFO: rcu detected stall in do_idle run #6: crashed: BUG: soft lockup in smp_call_function run #7: crashed: INFO: rcu detected stall in do_idle run #8: crashed: INFO: rcu detected stall in netlink_sendmsg run #9: crashed: no output from test machine testing release v5.7 testing commit 3d77e6a8804abcc0504c904bd6e5cdf3a5cf8162 with gcc (GCC) 8.1.0 kernel signature: f53bb4c27c11e0240e95b8c47d3f26e669d4c53ecd15976b60fe936a7b314e02 run #0: crashed: INFO: rcu detected stall in corrupted run #1: crashed: INFO: rcu detected stall in sys_clock_settime run #2: crashed: INFO: rcu detected stall in sys_clock_settime run #3: crashed: INFO: rcu detected stall in corrupted run #4: crashed: BUG: soft lockup in smp_call_function run #5: crashed: BUG: soft lockup in smp_call_function run #6: crashed: BUG: soft lockup in smp_call_function run #7: crashed: BUG: soft lockup in smp_call_function run #8: crashed: no output from test machine run #9: crashed: no output from test machine testing release v5.6 testing commit 7111951b8d4973bda27ff663f2cf18b663d15b48 with gcc (GCC) 8.1.0 kernel signature: 8fc289b15804cb013c656809fe944c894b809ddde3db72ef65cd9f3677e593f4 run #0: crashed: INFO: rcu detected stall in batadv_nc_worker run #1: crashed: INFO: rcu detected stall in netlink_sendmsg run #2: crashed: BUG: soft lockup in smp_call_function run #3: crashed: BUG: soft lockup in smp_call_function run #4: crashed: BUG: soft lockup in smp_call_function run #5: crashed: no output from test machine run #6: crashed: no output from test machine run #7: crashed: no output from test machine run #8: crashed: no output from test machine run #9: crashed: no output from test machine testing release v5.5 testing commit d5226fa6dbae0569ee43ecfc08bdcd6770fc4755 with gcc (GCC) 8.1.0 kernel signature: fbc8bc2128181835e588e63216c8895cab155d2688f8cc4470f261f953e38a29 all runs: crashed: BUG: sleeping function called from invalid context in cpus_read_lock testing release v5.4 testing commit 219d54332a09e8d8741c1e1982f5eae56099de85 with gcc (GCC) 8.1.0 kernel signature: 7673b1ce8c4530929c2181416624688bad6ce608ea0816516ea69bf379b8e2f3 all runs: crashed: BUG: sleeping function called from invalid context in cpus_read_lock testing release v5.3 testing commit 4d856f72c10ecb060868ed10ff1b1453943fc6c8 with gcc (GCC) 8.1.0 kernel signature: 895f2a60c58d8e706d8d66b53f1b9b0ed12eadfb30fa5b7858a7f00c279b65b2 all runs: crashed: BUG: sleeping function called from invalid context in cpus_read_lock testing release v5.2 testing commit 0ecfebd2b52404ae0c54a878c872bb93363ada36 with gcc (GCC) 8.1.0 kernel signature: 3f0f1e02a67976b38b836877decff572347dc01dd91aea127c1bf1113f569e8e all runs: crashed: BUG: sleeping function called from invalid context in cpus_read_lock testing release v5.1 testing commit e93c9c99a629c61837d5a7fc2120cd2b6c70dbdd with gcc (GCC) 8.1.0 kernel signature: 3729b39cba186890a92a2051ce62e01eecbfb2c6c6df8d2aca48e553813fcf41 run #0: crashed: INFO: rcu detected stall in rtnl_newlink run #1: crashed: INFO: rcu detected stall in sys_clock_settime run #2: crashed: INFO: rcu detected stall in sys_clock_settime run #3: crashed: INFO: rcu detected stall in sys_clock_settime run #4: crashed: INFO: rcu detected stall in sys_clock_settime run #5: crashed: INFO: rcu detected stall in sys_clock_settime run #6: crashed: INFO: rcu detected stall in sys_clock_settime run #7: crashed: BUG: soft lockup in smp_call_function run #8: crashed: BUG: soft lockup in smp_call_function run #9: crashed: BUG: soft lockup in smp_call_function testing release v5.0 testing commit 1c163f4c7b3f621efff9b28a47abb36f7378d783 with gcc (GCC) 8.1.0 kernel signature: 8107c2b0038c1edc3b8a0597ae9f5595e940e1c31ae0c5669cdceaa45d2cb7b0 run #0: crashed: INFO: rcu detected stall in batadv_nc_worker run #1: crashed: INFO: rcu detected stall in sys_clock_settime run #2: crashed: INFO: rcu detected stall in smp_call_function run #3: crashed: INFO: rcu detected stall in smp_call_function run #4: crashed: INFO: rcu detected stall in smp_call_function run #5: crashed: BUG: soft lockup in smp_call_function run #6: crashed: BUG: soft lockup in smp_call_function run #7: crashed: BUG: soft lockup in smp_call_function run #8: crashed: BUG: soft lockup in smp_call_function run #9: crashed: no output from test machine testing release v4.20 testing commit 8fe28cb58bcb235034b64cbbb7550a8a43fd88be with gcc (GCC) 8.1.0 kernel signature: 655190d3f6168a1b81fd3d8472223920aa3f4e6ebf5e397e463b2f7a9b992c8a run #0: crashed: INFO: rcu detected stall in ___preempt_schedule run #1: crashed: INFO: rcu detected stall in sys_clock_settime run #2: crashed: INFO: rcu detected stall in sys_clock_settime run #3: crashed: INFO: rcu detected stall in sys_clock_settime run #4: crashed: INFO: rcu detected stall in sys_clock_settime run #5: crashed: BUG: soft lockup in smp_call_function run #6: crashed: BUG: soft lockup in smp_call_function run #7: crashed: BUG: soft lockup in smp_call_function run #8: crashed: no output from test machine run #9: crashed: no output from test machine testing release v4.19 testing commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d with gcc (GCC) 8.1.0 kernel signature: 24cd5fd3e98e115c77d19d8fd5f00c9a2781162ed8fe0bffd9b2c0a5e0198061 run #0: OK run #1: OK run #2: OK run #3: OK run #4: OK run #5: OK run #6: OK run #7: OK run #8: OK run #9: crashed: kernel panic: panic_on_warn set testing release v4.18 testing commit 94710cac0ef4ee177a63b5227664b38c95bbf703 with gcc (GCC) 8.1.0 kernel signature: 4fa2cc11c7d1204167d1ff0606a4818b60bf56ab9f77ac7ddcfdfd87355463f7 all runs: OK # git bisect start 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d 94710cac0ef4ee177a63b5227664b38c95bbf703 Bisecting: 7596 revisions left to test after this (roughly 13 steps) [db06f826ec12bf0701ea7fc0a3c0aa00b84417c8] Merge tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux testing commit db06f826ec12bf0701ea7fc0a3c0aa00b84417c8 with gcc (GCC) 8.1.0 kernel signature: 958c373b46113cd28d5cfd57b72912707fc751bd33de62647c6a5c511b2fbc80 all runs: OK # git bisect good db06f826ec12bf0701ea7fc0a3c0aa00b84417c8 Bisecting: 3768 revisions left to test after this (roughly 12 steps) [cd9b44f90763c3367e8dd0601849ffb028e8ba52] Merge branch 'akpm' (patches from Andrew) testing commit cd9b44f90763c3367e8dd0601849ffb028e8ba52 with gcc (GCC) 8.1.0 kernel signature: 54506293c1475f75db603b0bf33b17ec6ae54fe54c697213ebc356d2021679ae all runs: OK # git bisect good cd9b44f90763c3367e8dd0601849ffb028e8ba52 Bisecting: 1886 revisions left to test after this (roughly 11 steps) [4290d5b9ca018be10c7582524f7500df731bfab0] Merge tag 'for-linus-4.19b-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip testing commit 4290d5b9ca018be10c7582524f7500df731bfab0 with gcc (GCC) 8.1.0 kernel signature: c09ede6390ca06dc3ad8a76451e4ba398fcdaec7ff9dc41540bbaa427b41b7b6 all runs: OK # git bisect good 4290d5b9ca018be10c7582524f7500df731bfab0 Bisecting: 942 revisions left to test after this (roughly 10 steps) [576156bb01a62c1f64b32b416593862bb34bddaa] Merge branch 'for-upstream/malidp-fixes' of git://linux-arm.org/linux-ld into drm-fixes testing commit 576156bb01a62c1f64b32b416593862bb34bddaa with gcc (GCC) 8.1.0 kernel signature: 7b49f6f1a9cc9ab472bca4a93e5eaac01642b34ebf2414cf3e36e2a347ea9478 all runs: OK # git bisect good 576156bb01a62c1f64b32b416593862bb34bddaa Bisecting: 470 revisions left to test after this (roughly 9 steps) [4fbeba43b9b6f76a270108edcf5305dc1882a478] Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6 testing commit 4fbeba43b9b6f76a270108edcf5305dc1882a478 with gcc (GCC) 8.1.0 kernel signature: 0a2a114e4f30cf68f24377eb6cd1e5fdd80b5ab4ad0d158befc021b8d23e27fc all runs: OK # git bisect good 4fbeba43b9b6f76a270108edcf5305dc1882a478 Bisecting: 218 revisions left to test after this (roughly 8 steps) [90ad18418c2d3db23ee827cdd74fed2ca9b70a18] Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net testing commit 90ad18418c2d3db23ee827cdd74fed2ca9b70a18 with gcc (GCC) 8.1.0 kernel signature: 3dc8db229692b53978aaaa4bfab4fe79f2864268f56ae6995aa2c5d23f15729a all runs: OK # git bisect good 90ad18418c2d3db23ee827cdd74fed2ca9b70a18 Bisecting: 121 revisions left to test after this (roughly 7 steps) [2a96661054452c3016c377d72a38c6d4948ea6ae] Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc testing commit 2a96661054452c3016c377d72a38c6d4948ea6ae with gcc (GCC) 8.1.0 kernel signature: c4e02d8f4bc97b35ebe452d7b51c5510a263911778fc50537a4418077bc0c6d8 all runs: OK # git bisect good 2a96661054452c3016c377d72a38c6d4948ea6ae Bisecting: 62 revisions left to test after this (roughly 6 steps) [b2a205ff49b9c55d4bdda1bdb10ad19ebd646221] Merge tag 'for-linus-20181019' of git://git.kernel.dk/linux-block testing commit b2a205ff49b9c55d4bdda1bdb10ad19ebd646221 with gcc (GCC) 8.1.0 kernel signature: 9c2227dd0642475e8ad5521bf2f88c97b860f9a3d5264619f7e31a067f59e232 all runs: OK # git bisect good b2a205ff49b9c55d4bdda1bdb10ad19ebd646221 Bisecting: 29 revisions left to test after this (roughly 5 steps) [9b00eb8ac2738b27a1469046f2ca76449dcdf04a] Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip testing commit 9b00eb8ac2738b27a1469046f2ca76449dcdf04a with gcc (GCC) 8.1.0 kernel signature: 7dace904ea563093fd37d7521fa68d544fc10b533103dd606a437fbc9502c63d all runs: OK # git bisect good 9b00eb8ac2738b27a1469046f2ca76449dcdf04a Bisecting: 15 revisions left to test after this (roughly 4 steps) [b0d04fb56b3173626a15406d69f3026ca313057f] Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip testing commit b0d04fb56b3173626a15406d69f3026ca313057f with gcc (GCC) 8.1.0 kernel signature: 5a699505239a40a6381b5895ea446a27b8003f41b58ae08bc5d6cc956df23be2 all runs: OK # git bisect good b0d04fb56b3173626a15406d69f3026ca313057f Bisecting: 7 revisions left to test after this (roughly 3 steps) [467e050e9760fc31dcf854ec88401e18419f5f78] Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux testing commit 467e050e9760fc31dcf854ec88401e18419f5f78 with gcc (GCC) 8.1.0 kernel signature: a369e705ac3f0b6f372645641a7ea8a80f3674f0d1a06614daaa147bdcd06e57 all runs: OK # git bisect good 467e050e9760fc31dcf854ec88401e18419f5f78 Bisecting: 3 revisions left to test after this (roughly 2 steps) [f7e585843217caff0aa9fb7dc9d796f0fa92162b] Code of Conduct: Provide links between the two documents testing commit f7e585843217caff0aa9fb7dc9d796f0fa92162b with gcc (GCC) 8.1.0 kernel signature: 5def2c862b509d4fee7171ce3dc2793f05e002d7442b9e8e460fbe73dbf89c08 all runs: OK # git bisect good f7e585843217caff0aa9fb7dc9d796f0fa92162b Bisecting: 1 revision left to test after this (roughly 1 step) [f3f76d640141e9a5aababafb80abbdc1c3c46823] Code of Conduct: Change the contact email address testing commit f3f76d640141e9a5aababafb80abbdc1c3c46823 with gcc (GCC) 8.1.0 kernel signature: 79f28145874373143b4ef800aecb9512019d091726c6d918d35ab8ba0f91f2f4 all runs: OK # git bisect good f3f76d640141e9a5aababafb80abbdc1c3c46823 Bisecting: 0 revisions left to test after this (roughly 0 steps) [8e630c31a3dfc7f4ab1007f95dd507cb2fe1dda5] MAINTAINERS: Add an entry for the code of conduct testing commit 8e630c31a3dfc7f4ab1007f95dd507cb2fe1dda5 with gcc (GCC) 8.1.0 kernel signature: d298e3e637dbb40f3e947cf1f4c55893c76c9f3db63adff888a3a354c0e7fe3d all runs: OK # git bisect good 8e630c31a3dfc7f4ab1007f95dd507cb2fe1dda5 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d is the first bad commit commit 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d Author: Greg Kroah-Hartman Date: Mon Oct 22 07:37:37 2018 +0100 Linux 4.19 Makefile | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) culprit signature: 24cd5fd3e98e115c77d19d8fd5f00c9a2781162ed8fe0bffd9b2c0a5e0198061 parent signature: d298e3e637dbb40f3e947cf1f4c55893c76c9f3db63adff888a3a354c0e7fe3d revisions tested: 26, total time: 6h16m32.141569751s (build: 2h34m24.088665218s, test: 3h37m58.440319282s) first bad commit: 84df9525b0c27f3ebc2ebb1864fa62a97fdedb7d Linux 4.19 cc: ["gregkh@linuxfoundation.org" "linux-kbuild@vger.kernel.org" "linux-kernel@vger.kernel.org" "michal.lkml@markovi.net" "yamada.masahiro@socionext.com"] crash: kernel panic: panic_on_warn set ^ ffff88009b575c00: fb fb fb fb fb fb fb fb fc fc fc fc fc fc fc fc ffff88009b575c80: 00 00 00 00 00 00 00 00 fc fc fc fc fc fc fc fc ================================================================== Disabling lock debugging due to kernel taint Kernel panic - not syncing: panic_on_warn set ... CPU: 0 PID: 208 Comm: kworker/u4:3 Tainted: G B 4.19.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: bat_events batadv_iv_send_outstanding_bat_ogm_packet Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x15a/0x20a lib/dump_stack.c:113 panic+0x1c6/0x36b kernel/panic.c:184 kasan_end_report+0x47/0x4f mm/kasan/report.c:180 kasan_report_error mm/kasan/report.c:359 [inline] kasan_report.cold.7+0x76/0x307 mm/kasan/report.c:412 check_memory_region_inline mm/kasan/kasan.c:260 [inline] check_memory_region+0x13c/0x1b0 mm/kasan/kasan.c:267 memcpy+0x23/0x50 mm/kasan/kasan.c:302 memcpy include/linux/string.h:345 [inline] batadv_iv_ogm_aggregate_new net/batman-adv/bat_iv_ogm.c:724 [inline] batadv_iv_ogm_queue_add+0x326/0xe50 net/batman-adv/bat_iv_ogm.c:820 batadv_iv_ogm_schedule+0xb7e/0xf30 net/batman-adv/bat_iv_ogm.c:989 batadv_iv_send_outstanding_bat_ogm_packet+0x4b2/0x7b0 net/batman-adv/bat_iv_ogm.c:1817 process_one_work+0x7b9/0x15a0 kernel/workqueue.c:2153 worker_thread+0x85/0xb60 kernel/workqueue.c:2296 kthread+0x324/0x3e0 kernel/kthread.c:246 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:413 Kernel Offset: disabled Rebooting in 86400 seconds..